Hi Harry, you can use Hygrometer inside and outside of the bag. Its up to you use turn wise or at the same time with two meters.

Thank you very much for your help Asjad, I will give that a go!

There are thermohygrometers equiped with facility that will be placed outside and a terminal will give you the humidity inside the bag

There a a number of micrometeorological issues with the use of pollination bags, but I know of no comprehensive review of the subject. For some light is reduced by an estimated 50%, temperatures are elevated by greenhouse effect, and humidities are higher. For the latter, you should consult the work of S. Corbet on measuring humidity/saturation deficit in enclosed spaces, including within flowers. She has published on that with a nice review in the comprehensive book "Practical Pollination Biology" (available in UK from Natural History Book, Totnes, Devon). Since publication of that book, advances in technology have taken place. For your work, it may be that the Hobo devices would work well. They are small, inexpensive and reliable. Corbet's "wiggly wire" might be better for work at a finer level. You can also build your own wet-and-dry thermistor probes, or thermocouples, but they rely on evaporation so influence the humidity of the area in which the probes are located!

Wind speed in pollination bags is of concern to people working with anemophilous or ambophilous plants. New work by Dr. David Greene and his team at Concordia University (Geography Dept.), Montreal is on going.

I hope this helps a bit.

Happy New Year, Peter

Thank you very much for all your help. I will investigate these paths further and if i can help you please give me a shout!

Good information for artificial pollination

Best regards